Carry actual flow state and freeze callback round identity

Local review candidate only. Explicitly selected inherited prerequisites and prior repair patches; unrelated WIP and independent MQ fixes are excluded. No push or deployment authorized.

src/main/java/com/yunhai/flowcenter/callback/CallbackDispatcher.java

@@ -120,6 +120,10 @@ public class CallbackDispatcher {
             if (event.getData() != null) {
                 data.putAll(event.getData());
             }
+            // 身份在事件发布线程中冻结，不能用 AFTER_COMMIT 重读到的新轮给旧事件重新贴标。
+            if (event.getRoundIdentity() != null) {
+                data.putAll(event.getRoundIdentity());
+            }
             payload.put("data", data);
             String payloadJson = objectMapper.writeValueAsString(payload);
 

src/main/java/com/yunhai/flowcenter/callback/FlowEventIdentityListener.java

@@ -0,0 +1,23 @@
+package com.yunhai.flowcenter.callback;
+
+import com.yunhai.flowcenter.engine.FlowEvent;
+import com.yunhai.flowcenter.repository.FlwInstanceRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.event.EventListener;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+import org.springframework.stereotype.Component;
+
+/** 同步发布阶段冻结轮次身份；不修改引擎或 apply/v2 七支分支。 */
+@Component
+@RequiredArgsConstructor
+public class FlowEventIdentityListener {
+    private final FlwInstanceRepository instances;
+
+    @EventListener
+    @Order(Ordered.HIGHEST_PRECEDENCE)
+    public void capture(FlowEvent event) {
+        instances.findById(event.getInstanceId()).ifPresent(instance ->
+                event.captureRoundIdentity(instance.getApplyRound(), instance.getApplyRequestToken()));
+    }
+}